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Positive discrimination is the same as negative discrimination, but "on the other foot."
In a zero-sum situation every act of positive discrimination of one group or individual results in negative discrimination of another group or individual of equal magnitude.
And because negative discrimination is immoral, positive discrimination in a zero sum situation is equally immoral.
It is wrong to punish innocent people.
Disadvantaged groups suffer or have suffered from discrimination within a culture which created inequalities in employment, pay and access to education.
Positive discrimination is effective in balancing existing inequalities in employment, pay and access to education.
That may or may not be the case, but it does not address the premise that positive discrimination is immoral. You may argue that such effects offset the immorality of positive discrimination, but you have not done so. nobody
Existing wrongs and imbalances can not be - in reasonable time - fixed by means of equal opportunities (level playing field). Therefore positive discrimination is a necessary lesser evil.